Hard drives are already slowly replaced with SSD's (Solid State Drive). They're currently cap out at 512GB's, and are very, very expensive. But the benefits are of course no moving parts, and much faster.

This is almost mind boggling...a 2048 GB SD card!! No need for my external hard drive that I have all my pic and music backed up on. Now I want to know how much they want for one. It would have to be a least $300.